Pilot Study on the Clinical Efficacy of Focused Ultrasound-Mediated Targeted Drug Delivery System Combined With Neoadjuvant Therapy for HER2-Positive Breast Cancer

Inclusion Criteria: 1. Female patients aged 18-70 years. 2. Histologically confirmed HER2 positive breast cancer, with indication for neoadjuvant chemotherapy, and scheduled to receive the T(P)CbHP neoadjuvant regimen. 3. TNM stage T2N0-2M0. 4. Adequate bone marrow reserve (ANC \>1.5×10⁹/L, platelets \>100×10⁹/L). 5. Normal liver function (ALAT, ASAT, and bilirubin \<2.5× upper limit of normal). 6. Adequate renal function (creatinine clearance \>50 mL/min). 7. Left ventricular ejection fraction (LVEF) ≥50% measured by echocardiography or MUGA. 8. No psychological, family, social, or geographical conditions that would compromise compliance with the study protocol and follow-up schedule. 9. No medical conditions that would place the subject at undue risk. 10. Written informed consent signed by the subject. Exclusion Criteria: 1. Prior history of radiotherapy or chemotherapy. 2. Pregnant or lactating patients. 3. Presence of distant metastasis. 4. Bilateral invasive breast cancer. 5. Concurrent administration of other anticancer therapies or another investigational agent. 6. inadequate physical tolerance, including significant cardiovascular, hepatic, or renal dysfunction, massive ascites, intestinal obstruction, severe infection, high fever, as well as water-electrolyte and acid-base imbalance. 7. Patients with known hyper sensitivity to SonoVue®.